Photocyclization reactions. Part 4 . Synthesis of naphtho[1,8-<i>bc</i>]-furans and cyclohepta[<i>cd</i>]benzofurans using photocyclization of Ethyl 2-(8-Oxo-5,6,7,8-tetrahydro-1-naphthyloxy)acetates and ethyl 2-(5-Oxo-6,7,8,9-tetrahydro-5<i>H</i>-benzocyclohepten-4-yloxy)acetates
作者:Essam Mohamed Sharshira、Haruki Iwanami、Mutsuo Okamura、Eietsu Hasegawa、Takaaki Horaguchi
DOI:10.1002/jhet.5570330124
日期:1996.1
Photocyclization reactions were carried out on ethyl 2-(8-oxo-5,6,7,8-tetrahydro-1-naphthyloxy)acetates 1a-e and ethyl 2-(5-oxo-6,7,8,9-tetrahydro-5H-benzocyclohepten-4-yloxy)acetates 2a-e in acetonitrile. Irradiation of 1a-e gave naphtho[1,8-bc]furanols 3a-e and naphtho[1,8-bc]furans 4a-e in 33–83% yields and ethyl acrylates 5b-d were produced in 3–25% yields during irradiation of 1b-d. On the other
在2-(8-氧代-5,6,7,8-四氢-1-萘氧基)乙酸乙酯1a-e和2-(5-氧代-6,7,8,9-四氢乙酯)乙酸乙酯上进行光环化反应在乙腈中的-5 H-苯并环庚基-4-基氧基)乙酸酯2a-e。的照射1A-E,得到萘并[1,8- BC ] furanols 3A-E和萘并[1,8- BC ]呋喃4A-E在33-83%的产率和丙烯酸乙酯的5b-d是在3-25%的产1b-d辐照时的产率。另一方面,2a-e提供了环庚基[ ad |苯并呋喃醇6a-e和环庚基[ ad]]苯并呋喃7a-e,收率44-87%。丙烯酸乙酯8b-d的辐照2b-d产率为7-43%。讨论了取代基对光环化和反应途径的影响。